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Less short: v7 will be upgradable to v8 for everything but sales history. As sales history is a key feature of a POS software, we can say it's not upgradable, don't you think ? :)

And now, the very long version :

As you may already know, we are french people. There have been a huge legislative change around POS software.

The main point is that you need to build a software that cannot delete sales. It can only register negative sales so that if you try to delete sales, you will have to explain why you did so.

In fact, it's a very good idea for every country in the world, so we are doing it in Pastèque's core. But it involves major refactoring of our data model. Anyway, it was really a shitty one, and refactoring it is a good idea anyway :)